Hello,
1) If you use Static Block to create footer and WPBakery columns to create layout then choose the 1 column layout in Theme Options http://prntscr.com/o705f7 In another case you have 4 columns with paddings http://prntscr.com/o705pr
2) Every default element has default margin http://prntscr.com/o7073v Use design options to remove or change it http://prntscr.com/o707py
Check now.
Regards